Why Australian Tea Tree Oil and Eucalyptus Oil?Australian tea tree oil and eucalyptus oils have been shown to be effective against all three categories of infectious organisms: bacteria, fungus and viruses. Australian tea tree oil is an effective natural deodorizer and cleaner Australian tea tree oil has been approved by European government authorities and included in the European Pharmacopoeia. Claims regarding the medical properties of tea tree oil are not sanctioned by the US authorities or the FDA.